Can I Rollback 3-4 versions? Can Not change background form color

I LOVE this APP it’s been so Great for so long….however the recent updates where the layout and UI interface changed things just have been getting buggy. At this latest version I can’t change the most important thing which is the form background color.

Can I Rollback 3-4 versions? I Can Not change background form colors and and most other color controls are very buggy in the last 3-4 versions. Can you supply links to 5.5 or 5.4. Not sure why it’s so buggy? Thank you